The Syrian regime on Tuesday accepted the terms of a ceasefire deal announced by the United States and Russia, according to a foreign ministry statement seen by AFP.

The statement said the regime would stop armed operations but would "continue counter-terrorism efforts" against the Daesh group, Al-Qaeda and affiliated groups.

Daesh and Al-Qaeda were excluded from the ceasefire agreement announced on Monday.

Meanwhile, the main opposition grouping on Monday said it accepted a ceasefire deal announced by the United States and Russia on Monday if humanitarian "conditions" were met.

The statement by the Riyadh-based High Negotiations Committee came hours after Moscow and Washington said a ceasefire in war-torn Syria was set to begin overnight Friday-Saturday.

"After HNC general coordinator Riad Hijab presented the results of his discussions with opposition factions across all fronts, we agreed to respond positively to international efforts to reach a truce deal," the HNC said.

But its "commitment to the truce is conditional" on the lifting of sieges, release of prisoners, a halt to bombardment of civilians and the delivery of humanitarian aid.

In a joint announcement earlier Monday, the United States and Russia said parties in Syria that wanted to commit to the cessation of hostilities should do so by noon Damascus time (1000 GMT) on Friday